CellarPro 4000SWC SPLIT SYSTEM WATER COOLED, 7649 - Manual (Page 25)

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valve. Verify the solenoid is powered as indicated by the compressor icon
("snowflake") on the temperature controller display.
5. Pressurize the system to a maximum of 150PSIG of dry nitrogen. It is important
to add nitrogen though both the high and low side access valves on the
condensing unit to make sure the system is fully pressurized. Mark the pressure
and hold for a minimum of 1 hour. If the pressure holds, proceed to the next
step, otherwise locate and repair the leak and repeat this step.
6. Evacuate the system to a minimum of 500 microns. It is important to pull a
vacuum though both the high and low side access valves on the condensing
unit to make sure the system is fully evacuated. If the vacuum is achieved,
proceed to the next step, otherwise locate and repair the leak and repeat from
step 4.
7. Disconnect the vacuum pump, but leave the system under vacuum. Use a
charging scale to accurately weigh in the refrigerant. Charge liquid R-134a
refrigerant through the liquid service valve according to the charge pounds
indicated in the "System R-134a Charge Guidelines" chart below. Additional
refrigerant may need to be added, using the steps outlined below. DO NOT
USE REFRIGERANT WITH ADDITIVES.
8. Important: The most common causes of compressor failure are
refrigerant overcharge, adding liquid refrigerant through the suction
access valve, and cold compressor starts. If starting up the system in a cold
ambient, or if the system has been sitting idle for more than 24 hours, it is critical
to warm the bottom shell of the compressor above the ambient temperature for
30 minutes to drive excess refrigerant out of the compressor oil.
9. Connect power to the Evaporator and Condensing unit, and activate the system.
IMPORTANT: If the system does not power up after the 3 minute start up
delay, verify field wiring according to the appropriate wiring diagram. If
correct, disconnect power from the system and contact Cellarpro at
707.794.8000.
10. The water valve should be adjusted so the leaving water temperature does not
exceed 95°F. For normal operation the water valve must be set to maintain a
refrigerant head pressure (measured at the liquid Rotolock valve) no higher than
150 PSIG.
To set the water valve, the ¼” square head range adjusting screw
with a screwdriver slot on the water valve may be adjusted with standard service
valve wrenches or screwdrivers. To raise the valve opening point, turn the
adjusting screw, located at the top of the range spring housing,
counterclockwise. Turn the adjusting screw clockwise to lower the operating
point. If the supply water pressure is above 80 PSIG, a pressure reducer MUST
be installed ahead of the condenser inlet so the water valve will work properly.
11. Measure pressures and temperatures to verify the system is within normal
operating limits as indicated on the Split System Data Sheet. A loose copy of
the Data Sheet is provided with the unit, and an additional copy is included at